Adjustment of the Optical Properties of Dispersion Derived Carbon Nanotube Coatings

Abstract

Porous carbon nanotube coatings for potential solar thermal receiver applications were generated on silicon carbide via an infiltration process from an aqueous dispersion. A screening evaluation was applied to generate carbon nanotube coatings with enhanced absorption, i.e., reduced reflection of solar wavelength spectra from 2 500-500 nm. Structures with low density nanotube packing with a total reflectance <2% were fabricated from a low concentration dispersion of sterically stabilized (PVP) carbon nanotubes. Though the optical performance is lower when compared to carbon nanotube coatings generated by CVD, the filtration method offers control of the nanotube pore structure over a wide range, a greater flexibility with regards to substrate geometry and excellent up-scaling capability. B. Weisenseel, Prof. P. Greil Energy Campus N€ urnberg, F€ urther Str. 250, 90429, N€ urnberg, Germany [**] The authors thank the Energie Campus N€ urnberg for providing services and facilities and financial support through the "Bavaria on the Move" initiative of the state of Bavaria. Furthermore, support from DFG Reinhart Koselleck project GR 961/32 and DFG FE 1209/1 is gratefully acknowledged. 624 wileyonlinelibrary.com

Smooth surface induced glossy appearance of freestanding multiwall carbon nanotube sheet

“…The studies of carbon nanotube (CNT) structures, such as vertically aligned multi-walled carbon nanotube (MWCNT) arrays [1,2], coating of MWCNT mats [1,3], CNT forest [4,5], CNT honeycomb structures [6], filtrated CNT coating [7], spun CNT sheet [8], were commonly focused on the black color, low reflectance, and matt surface appearance.…”